Is it possible to set an isolation level when connecting with powershell. This is for SQL 2008r2. I want to connect at the snapshot level then issue several BCP out statements (one per table)Is it possible?

You'd have to use bcp with the queryout option and specify the isolation level in the query expression, for each bcp that you run. I'm not even sure SET TRANSACTION ISOLATION LEVEL will work in that context, but it definitely can't be set one time for an entire batch of bcp commands.

Another option is to set the database to READ COMMITTED SNAPSHOT, that way you'll get snapshot isolation by default.